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I am E71 User, from 2 days, i used the car charger of my Bluetooth Headset BH-700 to charge my E71, after doing so, i found the battery of E71 draining very fast (3 or 4 hours only of work with most of the time idle), when i charge it with the Phone Charger, the Battery takes a very long time and never comes to full, and also drains very fast after

i looked into my phone charger and found it 5V 800 mA, and for the Bluetooth Headset, I Found it 5.7V 890 mA, i can see that the Bluetooth Headset has excess Voltage & Current than my E71 Phone Charger, is this the reason of the problem, did my E71 Battery got damaged or the whole phone is now Damaged

Please help me as i am very sad on my lovely E71, I used it for only 3 months